powerpc-eabi

powerpc-eabi

[Mircea Gherzan]

Hi,

I'm trying to build a cross-compiler for PowerPC EABI with the exact
tuple "powerpc-eabi". I'm using crosstool-ng 1.12.2.

1. Is there a way of setting CT_TARGET_SYS from within menuconfig
   or from somewhere else? All I could do was hack the powerpc.sh
   script to set this to "eabi" but this is quite dirty.

2. Is there a way o completely removing the vendor string from the
   tuple? I've tried with the menuconfig sed option but the build still
   ends up with "powerpc-unknown-eabi".


Thanks,
Mircea


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Re: powerpc-eabi

[Yann E. MORIN]

Mircea, All,

On Thursday 15 September 2011 13:37:40 Mircea Gherzan wrote:
> I'm trying to build a cross-compiler for PowerPC EABI with the exact
> tuple "powerpc-eabi". I'm using crosstool-ng 1.12.2.
> 
> 1. Is there a way of setting CT_TARGET_SYS from within menuconfig
>    or from somewhere else? All I could do was hack the powerpc.sh
>    script to set this to "eabi" but this is quite dirty.

No, there's no such possibility. If you need EABI for PPC, it should be
done with a new config option + corresponding code in powerpc.sh.

That is, exactly what you did, but conditionaly on a config option.
Of course, EABI and SPE are probably incompatible, so both should be
guarded from each other, for example with a choice:

    config ARCH_ppc_ABI
        string
        default ""     if ARCH_ppc_ABI_DEFAULT
        default "eabi" if ARCH_ppc_ABI_EABI
        default "spe"  if ARCH_ppc_ABI_SPE

    choice
        bool
        prompt "ABI"
        default ARCH_ppc_ABI_DEFAULT

    config ARCH_ppc_ABI_DEFAULT
        bool
        prompt "default"

    config ARCH_ppc_ABI_EABI
        bool
        prompt "EABI"

    config ARCH_ppc_ABI_SPE
        bool
        prompt "SPE"

    endchoice


And in the script, something like:

    CT_TARGET_SYS="gnu"
    case "${CT_ARCH_ppc_ABI}" in
        "") ;;
        eabi)
            CT_TARGET_SYS="eabi"
            ;;
        spe)
            case "${CT_LIBC}" in
                glibc|eglibc)
                    CT_TARGET_SYS="gnuspe"
                    ;;
            esac
            ;;
    esac

Adapt to your own needs and to reality (eg. it might be "gnueabi" instead
of simply "eabi").

> 2. Is there a way o completely removing the vendor string from the
>    tuple? I've tried with the menuconfig sed option but the build still
>    ends up with "powerpc-unknown-eabi".

The tuple will always contain the vendor string. If you provide an empty
vendor string, it gets replaced with "unknown". It is however possible to
create aliases, and for each tool (eg. gcc, ar, as, ld...), a symlink is
made that points to the corresponding full-tuple tool.

If you want shorter aliases, you have two possibilities:

 - use the sed expression to mangle the tuple. In your case, that would
   be something like:
     CT_TARGET_ALIAS_SED_EXPR="s/-unknown-/-/;"
 - use a constant alias, in your case, something like:
     CT_TARGET_ALIAS="powerpc-eabi"
 - use both of the above

In any case, the tuple will always contain the vendor string, and aliases
will simply create symlinks.

Regards,
Yann E. MORIN.

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Re: powerpc-eabi

[Yann E. MORIN]

Mircea, All,

[Please, keep the list CCed.]

On Thursday 15 September 2011 21:24:26 Bryan Hundven wrote:
> I believe EABI is for bare-metal. If I'm wrong, please let me know.

I'm no PPS specialist, but that's what I recall as well, hence the code
snippet I sent.

Can you try what I suggested, and report back with a patch?
I hace personally no way of testing such a feature, so if you need it,
I'll gladly apply a patch.

Regards,
Yann E. MORIN.

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